Question

Find the inverse. f(x) = 3x+28

Answer 1

Set $y = f^{-1}(x)$ and $f(y) = x$

Interchange the variables $x$ and $y$

$3y + 28 = x\\3y = x - 28\\y = \frac{x - 28}{3} \\\\f^{-1}(x) = \frac{x - 28}{3}$